Compilare: user.cpp: In function ‘int main()’: user.cpp:77:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < Sol.size(); ++j) ^ user.cpp:98:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Sol.size(); ++i) ^ /tmp/ccrEeBf9.o: In function `main': user.cpp:(.text.startup+0x56): warning: the `gets' function is dangerous and should not be used.